光气反应器换热管腐蚀区域预测及结构优化

Prediction of Corrosion Region of Heat Exchange Tube in Phosgene Reactor and Structure Optimization

基于光气反应器数值模拟结果开展了换热管束腐蚀失效风险区预测,并利用涡流检测和内窥镜检测进行了验证。数值模拟结果表明,在较高入口流速下,反应气在管束平面未实现均匀分布,中心区域管束流速高,边壁流速较低,中心高流速区域管束由于冲蚀容易导致换热管腐蚀失效。通过增加挡板对反应器结构进行优化设计,反应气初始分布均匀性得以提升,是一种有效缓解腐蚀的方法。

Based on the numerical simulation results of phosgene reactor,the corrosion failure risk zone of heat exchange tube bundle was predicted and verified by eddy current testing and endoscopic testing.The numerical simulation results show that at a high inlet flow rate,the reaction gas is not uniformly distributed on the tube bundle plane,the tube bundle flow rate in the central area is high,and the side wall flow rate is low.The tube bundle in the central high flow rate area is prone to corrosion failure due to erosion.By adding baffles to optimize the reactor structure,the uniformity of initial distribution of reaction gas can be improved,which is an effective method to mitigate corrosion.